Circuits and methods for synchronizing non-constant frequency switching regulators with a phase locked loop
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United States of America Patent
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Nov 5, 2002
Grant Date -
Oct 10, 2002
app pub date -
Apr 6, 2001
filing date -
Apr 6, 2001
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Abstract
Methods for synchronizing non-constant frequency switching regulators with a phase locked loop are disclosed. The methods enable non-constant frequency switching regulators to be synchronized with a phase locked loop to achieve constant frequency operation in steady state while retaining the advantages of non-frequency operation to improve transient response and operate over a wider range of duty cycles. In addition, the methods enable multiple non-constant frequency regulators to be synchronized and operated in parallel to deliver higher power levels to the output than a single switching regulator.
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